![]() Earthtimes.org | Pfizer pulls the plug on Lipitor's successor MarketWatch - By MarketWatch. BOSTON (MarketWatch) -- Shares of Pfizer Inc. tumbled in early trading Monday after weekend news that it's pulling the plug on a planned successor to its best-selling cholesterol-lowering drug Lipitor over safety concerns. Scrutiny of Other Heart Drugs Could Grow After Failed Trial AstraZeneca shares gain after Pfizer drug fails |